Smallest unvented cylinder
What is the smallest unvented cylinder? The smallest unvented cylinder available from Flexiheat UK is typically an 80 litre unvented hot water cylinder, which can be supplied in either a direct or indirect version, depending on how the water needs to be heated. Whether the cylinder you require is direct or indirect, they are 703mm in height and 576mm in diameter. By their very nature, 80-litre unvented cylinders are also compact in physical dimensions due to their lower stored water volume.
80 litre direct unvented cylinder option
A direct unvented cylinder is heated only by electricity, using an immersion heater inside the cylinder. Flexiheat UK’s direct unvented cylinder range is available from 80 litres to 500 litres, with the 80 litre electric water heater fitted with a 1 x 3 kW immersion heater. This makes the smallest direct unvented cylinder a practical option for smaller properties, flats, offices, washrooms, annexes or applications where there is no gas boiler, oil boiler or central heating heat source available. It provides stored hot water directly from the mains water supply, giving mains pressure hot water without the need for a cold water storage tank. Our smallest direct unvented cylinder is detailed on this webpage – Unvented direct hot water cylinders 80 to 500 litres
80 litre indirect unvented cylinder option
An indirect unvented cylinder is different because it uses an internal heat exchanger coil connected to an external heat source, such as a gas, oil or electric boiler. Flexiheat UK explains that an indirect cylinder is heated by an external heat source through a coil inside the cylinder, while most indirect cylinders also include an immersion heater as a backup.
For customers looking for the smallest unvented cylinder as part of an electric boiler or electric combi-style system, Flexiheat UK details an option using a standard electric system boiler with the smallest 80 litre indirect unvented hot water storage cylinder. This provides a G3-compliant mains pressure hot water supply while keeping stored water volume low, helping to reduce standing heat loss and running costs. When paired with a 15kW electric boiler, for example, the 80 litre indirect cylinder can recover from cold to 65°C in around 21 minutes. Our full range of indirect unvented cylinders are detailed here – Unvented indirect hot water cylinders from 80 to 500 litres
Conclusion
In simple terms, choose the 80 litre direct unvented cylinder where electric immersion heating is required, or the 80 litre indirect unvented cylinder where the cylinder is being heated by a boiler or external heat source.
